Portable reciprocating saw machine



A. BILLS.

PORTABLE RECIPROCATING SAW MACHINE.

APPLICATION FILED FEB. I9, 1920 1 ,428,208 Y Patented Sept. 5, 1922.

5 nucmto'o Alexander Bil] Patented Sept. 5, 1922.

UNITED; STATES ALEXANDER BILLS, OFHOMES'IEAD, OREGON.

. PORTABLE 'RECIPROCATIITG SAW MACHINE.

Application filed February 19, 1920. Serial. n6. 359,567,.

To all whom it may concern Be it known that I, ALEXANDER BILLS, a citizen. of the United States, residing at Homestead, in Baker County and State of Oregon, have invented certain new and useful Improvements in. Portable Reciprocating Saw Machines,of which the following is a specification.

My present invention relates to improve ments in portable reciprocating saw machines of the drag type consisting of a cross cut saw or buck saw, and its adjustablesupporting frame, together With novel guiding means for the 'movement of the saw, and

further consisting in certain novel combinations and arrangements of parts for transmitting power to the saw, as will be described hereinafter. v

.The primary obj ectof theinvention is the provision of a sawing machine designed especially for cutting cordwood, or for sawingfelled trees for logs into convenient lengths, which is comparativelysimple' in construction, compact in arrangement, and

eflicient in performing the functions for which it is intended.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention, constructed and arranged according to the best mode. I have so far devised for the practical application of the principles of my invention, And while the structure exemplified in the drawings is a complete disclosure of one form of myinvention, it will be understood that colorable changes and alterations may be made within the scope ofmy claims without departing from the spirit of the invention. g t

Figure 1 is a viewin side elevation showing a portable reciprocating saw machine embodying my invention, and in position for actual use, showing the saw as having cut a kerf in a log.

Figure 2 is a top plan view of the machine in Figure 1.

Figure 3 is an enlarged detail sectional view through the saw, its endless chain for transmitting motion thereto, and the guideways and supportsfor said chain.

In the preferred form of the invention as illustrated in the drawings I have illustrated the portable machine as comprising a rectangular frame 1 made up of suitable metallic members riveted or bolted together with suitable braces to provide a stable and rigid support for the operating parts of themachine including an internalcombustionem gine or gasoline motor '20fjvvell known" type; wh ch 1s equipped with the necessary acces-f sorles'.

The machine may be supported ontlie 7 ground if convenient, or may be suspended at an adjustable altitude adapting itto various conditions of work,at three points of" suspension, as by the elongated framebars ,3

and 4;,preferably of metal and eachflfas h-"f ion ed'with a 'downturned end formed with a i spike or study5 to engage in the surfaceof the log L, to be sawe' 1 The elongated frame bar tprojects perpendicularly from the main frame 1, but the V bar 3 preferably diverges. therefrom at an angle, so that thespiked ends'are spaced apart, and suitable braces 6, 6, are provided to hold these horizontal bars rigidly in place, t

to support the machine at the'freeend "of the saw.

for theflsupport of the'machine ,frame,jby"

In addition to these two points of suspen utilizing a stake7,"having' the usual sharp;

enedjend to be driven into the ground, and

which stands upright in order' that the."

bracket 8, of metalymay be supported th ere-" on. Thebracket is firmly attached to the main frame 1, and its integral collar 8' may slide vertically thereon, a setbolt: 9 threaded in the collar being provided to securely hold the bracket and stake in rigid relation at the,

desired altitude.

The two spiked the support for the machine frame atone v frame may be elevated :or. lowered through its connection with thestake, and with the spikes 5' 5 as a'pivotal center,'to adapt the machine to logs of: different diameters, .or, toadapt the machine 'to irregula'rities in the surface of the ground.

The saw 10 is of the cross cut or buck saw type, with a free end, and adapted to be reciprocated to cut a kerf in the log as indi-' 11 to which the saw is pivoted by means of a pin 12 carried at one ofthe link joints of the flexible chain. Thus two working strokes arev given to the saw as the chain movesand the pin 12 travels outwardly toward the log 1 bars 3 and i l thus form.

end, and it will readily be apparent that the v the reciprocating movement of the saw is and returns inwardly from the saw, the

chain being suspended on the two sprocket wheels 13 and it on their respective shafts 15and16. v

Of the two sprocket Wheels 13 and 1 the former is the drive wheel for the chain and the latter an idler, and the shafts 15 and 16 of these wheels are supported or journaled in a. metallic platelT firmly attached to and forming a part of the main frame 1 of the machine, and located at one side 7 thereof, near the bottom of the frame. The longer shaft 15 is revolved directly from the motor 2 by the motor sprocket 18, the con-' necting sprocket chain 19, and a sprocket wheel, 20, on the shaft 15, located at the inner side, of the shaft supporting plate 17, i

and when the saw is in operation, thepower from the motor is continuously transmitted through this driving sprocket mechanism to the endless chain driving mechanism, and

accomplished through the travel of the endless chain t0 Wl1lC l1 the saw is pivotally connected, In this manner a comparatively long stroke is imparted to the saw, and it will be apparent that the length of the stroke may be governed by the distance between the two sprocket wheels 13 and 14 and the consequent length of the endless chain The 7 upper on the shaft plate 17 of the frame, such, guide-ways being formed by the bracket arms 21 and 22 projecting horizontally from the bracket plate 23 attached to the vshaft supporting plate 17, and forming lower supports for "the upper and lower flights res pectively of the chain. Upper guide means for the chain flights are provided by the guide plates 24 and 25 which co-act with the guide arms 21 and 22, and these several devices forming the guide means for the chain are disposed between the endless chain-supporting wheels 13 and 14-, and pro vide open end slots for guiding and travel therethrough of the pin 12 of the saw. In

this manner the pin is caused to travel in a true and straight path and consequently thelmotion of the saw is uniform and regular I ters Patent is"' and lower flights of the chain 'pass through and are guided 1n gu de ways as the pin travelsbetween'the supporting wheels, the reversal of the saw" stroke being accomplished as the pin travels around the sprocket wheels 13 and 14:. I

To hold the saw to its work and prevent Wabbling, or buckling of the saw, a guide grooved pulley or sheave 26 is utilizedto Figures 1 and 2, and this sheave is conveniently carried or journaled on the end of the saw guide arm 26, journaled at 27 on the shaft 16 of sprocket wheel 14- of the. endless chain.

The construction and operation of the machine Will'- re'adily'be apparent from the previous description taken in connection with the drawings, and will be obvious that the machine may be transported with facility and convenience from place to place, during sawing operations, and provides a self contained,Compact, light but strong and durable appliance for its purpose.

What I claim and desiiei to sec'ure'by Letis positively drivenfsproeket wheels on said shafts and an endless chain on said wheels, a reciprocable saw pivoted to the chain and guide means, for the saw, a pair hon- Zontal bracket a'rmsfiired to saidsupportbear'upon theback'edge of the saw as in mg plate between the wheels as under supports for thefrespective flights of the chain, and' a'pair of upper guide plate compi ementary to said'arm's for said chain flights,

whereby slots are U formedfor guiding the pivotal connection between the saw and cha n- In testimony whereof ,afliX my signature.

ALEXANDER BILLS. 

